Thomas Gottschall
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View article: Ultra‐compact tunable fiber laser for coherent anti‐Stokes Raman imaging
Ultra‐compact tunable fiber laser for coherent anti‐Stokes Raman imaging Open
This work describes the construction of an ultra‐compact narrowband fiber laser source for coherent anti‐Stokes Raman scattering microscopy of Raman tags, that is, for addressing Raman resonances of deuterated molecules and alkyne tags in …
View article: Relative amplitude noise transfer function of an Yb<sup>3+</sup>-doped fiber amplifier chain
Relative amplitude noise transfer function of an Yb<sup>3+</sup>-doped fiber amplifier chain Open
In this work we measure the frequency dependent transfer function of the amplitude noise for both the seed and pump power in an Yb3+-doped fiber amplifier chain. In particular, the relative intensity noise transfer function of this amplifi…
View article: Virtual HE histology by fiber-based picosecond two-photon microscopy
Virtual HE histology by fiber-based picosecond two-photon microscopy Open
Two-Photon Microscopy (TPM) can provide three-dimensional morphological and functional contrast in vivo. Through proper staining, TPM can be utilized to create virtual, H&E equivalent images and thus can improve throughput in histology-bas…
View article: Extraction of Enhanced, Ultrashort Laser Pulses from a Passive 10-MHz Stack-and-Dump Cavity
Extraction of Enhanced, Ultrashort Laser Pulses from a Passive 10-MHz Stack-and-Dump Cavity Open
Periodic dumping of ultrashort laser pulses from a passive multi-MHz repetition-rate enhancement cavity is a promising route towards multi-kHz repetition-rate pulses with Joule-level energies at an unparalleled average power. Here, we demo…
View article: High-average-power femtosecond laser at 258 nm
High-average-power femtosecond laser at 258 nm Open
We present an ultrafast fiber laser system delivering 4.6 W average power at 258 nm based on two-stage fourth-harmonic generation in beta barium borate (BBO). The beam quality is close to being diffraction limited with an M2 value of 1.3×1…
View article: Confining Brownian motion of single nanoparticles in an ABELtrap
Confining Brownian motion of single nanoparticles in an ABELtrap Open
Trapping nanoscopic objects to observe their dynamic behaviour for extended periods of time is an ongoing quest. Particularly, sub-100nm transparent objects are hard to catch and most techniques rely on immobilisation or transient diffusio…
View article: Fiber-based light sources for coherent raman scattering and multi-photon imaging
Fiber-based light sources for coherent raman scattering and multi-photon imaging Open
The progress in medicine, sanitation and overall prosperity has led to an increasing life-expectancy in developed countries. Consequently, degenerative and lifestyle-induced diseases, such as cardiovascular ones, Alzheimer's and certai…
View article: Extraction of enhanced, ultrashort laser pulses from a passive 10-MHz stack-and-dump cavity
Extraction of enhanced, ultrashort laser pulses from a passive 10-MHz stack-and-dump cavity Open
Periodic dumping of ultrashort laser pulses from a passive multi-MHz repetition-rate enhancement cavity is a promising route towards multi-kHz repetition-rate pulses with Joule-level energies at an unparalleled average power. Here, we demo…
View article: Energetic sub-2-cycle laser with 216 W average power
Energetic sub-2-cycle laser with 216 W average power Open
Few-cycle lasers are essential for many research areas such as attosecond physics that promise to address fundamental questions in science and technology. Therefore, further advancements are connected to significant progress in the underly…
View article: High-repetition-rate and high-photon-flux 70 eV high-harmonic source for coincidence ion imaging of gas-phase molecules
High-repetition-rate and high-photon-flux 70 eV high-harmonic source for coincidence ion imaging of gas-phase molecules Open
Unraveling and controlling chemical dynamics requires techniques to image structural changes of molecules with femtosecond temporal and picometer spatial resolution. Ultrashort-pulse x-ray free-electron lasers have significantly advanced t…
View article: Four-wave-mixing-based optical parametric oscillator delivering energetic, tunable, chirped femtosecond pulses for non-linear biomedical applications
Four-wave-mixing-based optical parametric oscillator delivering energetic, tunable, chirped femtosecond pulses for non-linear biomedical applications Open
A novel concept for an optical parametric oscillator based on four-wave mixing (FOPO) in an optical fiber is presented. This setup has the ability of generating highly chirped signal and idler pulses with compressed pulse durations below 6…
View article: Fiber‐based light sources for biomedical applications of coherent anti‐Stokes Raman scattering microscopy
Fiber‐based light sources for biomedical applications of coherent anti‐Stokes Raman scattering microscopy Open
During the past decade coherent anti‐Stokes Raman scattering (CARS) microscopy has evolved to one of the most powerful imaging techniques in the biomedical sciences, enabling the label‐free visualization of the chemical composition of tiss…